Because sexual innuendo is funny! Blatant sexual remarks are crude and lack any kind of humerous quality whatsoever, but when it is only implied it remains up to the interpretor to find the sexual connection. Does that make any sense? Anyone can say something sexual, but to take something innocent and make it sexual simply be rearrangeing where it is spoken required 3 dimensional thinking that everyone does not possess, therefore sexual innuendo is funny!

<UL TYPE=SQUARE>
<LI>And I thought they smelled bad on the outside.
<LI>Look at the size of that thing.
<LI>Put that thing away before you get us all killed.
<LI>Rise my friend.
<LI>I don't care what you smell, get in there.
</UL>

Yes, but you see Shimmergloom Amidala also possess the force. When she says, "Luke, at that speed do you think you will be able to pull out in time?", it is the future she sees. She is envisioning her unborn son in place of his father. Henceforth, she is foreshadowing the events to come with Anakin's fall to the darkside and her decent to putting on the armor and becoming Boba Fett. Can't you see? It is very simple.